93 2.3 Ranger Only Starts With Gas Pedal Pressed To The Floor

[tomw]

The short 'prime run' of the fuel pump when the key is first turned to ON is not dependent on a fuel pressure sensor to turn it off. It is just a timer circuit in the ECM/PCM/computer.
If the fuel pump regulator had a leaky diaphragm, it would indeed allow fuel flow through the vacuum line to the intake manifold. Fuel would be pumped under pressure through the vacuum line when the key was ON and the engine running. As far as I can determine, that is the ONLY way a bum regulator can feed the intake excess fuel. If it failed in a jammed up mode, it would increase fuel pressure above regulated, but it could not leak into the manifold, just spritz more fuel than expected. The computer would then note the rich condition, in a perfect world, and cut back on spritz time to lessen fuel effective flow. Short and Long Term Fuel Trims would be affected, and indicated if you had an OBD-II system that could be interrogated by a scan tool.
A failed regulator on a friends 4.0 dropped fuel mpg by 50% almost exactly, and caused black smoke to be pouring out the exhaust. Those regulators are imported, from Germany, not China, and the Germans are real proud of them, and charge ~$100 each for a replacement... So, a jammed regulator can overcome the 'trims' mentioned above, FWIW.
tom

 

[wbrockstar]

* UPDATE *

Well I was surprised to say the least about the fix.It turned out being a defective ect sensor causing my issue.
I disconnected the wiring harness from both coil packs,held the gas pedal to the floor then turned the key to start and cranked it for 10 seconds. ( Doing this process kept the spark plugs from firing and kept the injectors from spraying any fuel,but would still allow an injector to leak,if it was defective ) So after turning the key off,I removed all four spark plugs on the passenger (exhaust) side and all four plugs were black and soot covered,but none of them had wet fuel.So I reinstalled the plugs,wires and coil pack harnesses then tested the ect sensor after disconnecting its harness.It was reading Open,so I tested a spare ect sensor I had for my 5.0 Mustang and after it showed the correct ohms value,I installed it.Plugged the harness in,disconnected the neg battery cable for 10 minutes,reconnected the battery cable,started it up and whalla its running normal again,starting normal again,no pedal to the floor needed for startup and no fuel smoke passing by the window at startup.

So if anyone develops these symptoms,doing the steps mentioned above,which were suggested by
Ron D,is a great trouble shooting process for this type of issue.Thanks to Ron D and Cbr600rx7 for the suggestions to test the components listed,including the ect sensor.